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<div class="title">qwt_clipper.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Qwt Widget Library</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 1997   Josef Wilgen</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * Copyright (C) 2002   Uwe Rathmann</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * This library is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *****************************************************************************/</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; </div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &quot;qwt_clipper.h&quot;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &quot;qwt_point_polar.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;qwt_interval.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &quot;qwt_math.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;qpolygon.h&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;qrect.h&gt;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; </div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span>QwtClip</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;{</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    <span class="comment">// some templates used for inlining</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;    <span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> T &gt; <span class="keyword">class </span>LeftEdge;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    <span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> T &gt; <span class="keyword">class </span>RightEdge;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    <span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> T &gt; <span class="keyword">class </span>TopEdge;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;    <span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> T &gt; <span class="keyword">class </span>BottomEdge;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;}</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160; </div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Value &gt;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keyword">class </span>QwtClip::LeftEdge</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;{</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keyword">inline</span> LeftEdge( Value x1, Value, Value, Value ):</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        m_x1( x1 )</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    {</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    }</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160; </div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> isInside( <span class="keyword">const</span> Point&amp; p  )<span class="keyword"> const</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        <span class="keywordflow">return</span> p.x() &gt;= m_x1;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    }</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160; </div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keyword">inline</span> Point intersection( <span class="keyword">const</span> Point&amp; p1, <span class="keyword">const</span> Point&amp; p2 )<span class="keyword"> const</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keywordtype">double</span> dy = ( p1.y() - p2.y() ) / <span class="keywordtype">double</span>( p1.x() - p2.x() );</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        <span class="keywordflow">return</span> Point( m_x1, <span class="keyword">static_cast&lt;</span> Value <span class="keyword">&gt;</span>( p2.y() + ( m_x1 - p2.x() ) * dy ) );</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    }</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keyword">const</span> Value m_x1;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;};</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160; </div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Value &gt;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="keyword">class </span>QwtClip::RightEdge</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;{</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keyword">inline</span> RightEdge( Value, Value x2, Value, Value ):</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        m_x2( x2 )</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    {</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    }</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> isInside( <span class="keyword">const</span> Point&amp; p  )<span class="keyword"> const</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        <span class="keywordflow">return</span> p.x() &lt;= m_x2;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    }</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160; </div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <span class="keyword">inline</span> Point intersection( <span class="keyword">const</span> Point&amp; p1, <span class="keyword">const</span> Point&amp; p2 )<span class="keyword"> const</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        <span class="keywordtype">double</span> dy = ( p1.y() - p2.y() ) / <span class="keywordtype">double</span>( p1.x() - p2.x() );</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        <span class="keywordflow">return</span> Point( m_x2, <span class="keyword">static_cast&lt;</span> Value <span class="keyword">&gt;</span>( p2.y() + ( m_x2 - p2.x() ) * dy ) );</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    }</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="keyword">const</span> Value m_x2;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;};</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160; </div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Value &gt;</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">class </span>QwtClip::TopEdge</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;{</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keyword">inline</span> TopEdge( Value, Value, Value y1, Value ):</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        m_y1( y1 )</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    {</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    }</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> isInside( <span class="keyword">const</span> Point&amp; p  )<span class="keyword"> const</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        <span class="keywordflow">return</span> p.y() &gt;= m_y1;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    }</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160; </div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="keyword">inline</span> Point intersection( <span class="keyword">const</span> Point&amp; p1, <span class="keyword">const</span> Point&amp; p2 )<span class="keyword"> const</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        <span class="keywordtype">double</span> dx = ( p1.x() - p2.x() ) / <span class="keywordtype">double</span>( p1.y() - p2.y() );</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        <span class="keywordflow">return</span> Point( <span class="keyword">static_cast&lt;</span> Value <span class="keyword">&gt;</span>( p2.x() + ( m_y1 - p2.y() ) * dx ), m_y1 );</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    }</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160; </div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    <span class="keyword">const</span> Value m_y1;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;};</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160; </div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="keyword">template</span>&lt; <span class="keyword">class</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Value &gt;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="keyword">class </span>QwtClip::BottomEdge</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;{</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keyword">inline</span> BottomEdge( Value, Value, Value, Value y2 ):</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        m_y2( y2 )</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    {</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    }</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160; </div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> isInside( <span class="keyword">const</span> Point&amp; p )<span class="keyword"> const</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        <span class="keywordflow">return</span> p.y() &lt;= m_y2;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    }</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160; </div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    <span class="keyword">inline</span> Point intersection( <span class="keyword">const</span> Point&amp; p1, <span class="keyword">const</span> Point&amp; p2 )<span class="keyword"> const</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        <span class="keywordtype">double</span> dx = ( p1.x() - p2.x() ) / <span class="keywordtype">double</span>( p1.y() - p2.y() );</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;        <span class="keywordflow">return</span> Point( <span class="keyword">static_cast&lt;</span> Value <span class="keyword">&gt;</span>( p2.x() + ( m_y2 - p2.y() ) * dx ), m_y2 );</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    }</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160; </div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    <span class="keyword">const</span> Value m_y2;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;};</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160; </div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;<span class="keyword">using namespace </span>QwtClip;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160; </div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="keyword">template</span>&lt; <span class="keyword">class</span> Polygon, <span class="keyword">class</span> Rect, <span class="keyword">typename</span> T &gt;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="keyword">class </span>QwtPolygonClipper</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;{</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keyword">typedef</span> <span class="keyword">typename</span> Polygon::value_type Point;</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keyword">explicit</span> QwtPolygonClipper( <span class="keyword">const</span> Rect&amp; clipRect ):</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        m_clipRect( clipRect )</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    {</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    }</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160; </div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">clipPolygon</a>( Polygon&amp; points1, <span class="keywordtype">bool</span> closePolygon )<span class="keyword"> const</span></div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;<span class="preprocessor">#if 0</span></div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;        <span class="keywordflow">if</span> ( m_clipRect.contains( points1.boundingRect() ) )</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;            <span class="keywordflow">return</span> polygon;</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160; </div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;        Polygon points2;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;        points2.reserve( qMin( 256, points1.size() ) );</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160; </div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;        clipEdge&lt; LeftEdge&lt; Point, T &gt; &gt;( closePolygon, points1, points2 );</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;        clipEdge&lt; RightEdge&lt; Point, T &gt; &gt;( closePolygon, points2, points1 );</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;        clipEdge&lt; TopEdge&lt; Point, T &gt; &gt;( closePolygon, points1, points2 );</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        clipEdge&lt; BottomEdge&lt; Point, T &gt; &gt;( closePolygon, points2, points1 );</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    }</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    <span class="keyword">template</span>&lt; <span class="keyword">class</span> Edge &gt;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> clipEdge( <span class="keywordtype">bool</span> closePolygon,</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        <span class="keyword">const</span> Polygon&amp; points, Polygon&amp; clippedPoints )<span class="keyword"> const</span></div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;        clippedPoints.clear();</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160; </div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;        <span class="keywordflow">if</span> ( points.size() &lt; 2 )</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;        {</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;            <span class="keywordflow">if</span> ( points.size() == 1 )</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                clippedPoints += points[0];</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160; </div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;            <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;        }</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160; </div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;        <span class="keyword">const</span> Edge edge( m_clipRect.x(), m_clipRect.x() + m_clipRect.width(),</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;            m_clipRect.y(), m_clipRect.y() + m_clipRect.height() );</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160; </div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        <span class="keywordflow">if</span> ( !closePolygon )</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        {</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;            <span class="keyword">const</span> Point&amp; p1 = points.first();</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160; </div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;            <span class="keywordflow">if</span> ( edge.isInside( p1 ) )</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;                clippedPoints += p1;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;        }</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;        {</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;            <span class="keyword">const</span> Point&amp; p1 = points.first();</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;            <span class="keyword">const</span> Point&amp; p2 = points.last();</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160; </div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;            <span class="keywordflow">if</span> ( edge.isInside( p1 ) )</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;            {</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;                <span class="keywordflow">if</span> ( !edge.isInside( p2 ) )</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;                    clippedPoints += edge.intersection( p1, p2 );</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160; </div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;                clippedPoints += p1;</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;            }</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;            <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( edge.isInside( p2 ) )</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;            {</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;                clippedPoints += edge.intersection( p1, p2 );</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;            }</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;        }</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160; </div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;        <span class="keyword">const</span> uint nPoints = points.size();</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        <span class="keyword">const</span> Point* p = points.constData();</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160; </div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;        <span class="keywordflow">for</span> ( uint i = 1; i &lt; nPoints; i++ )</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;        {</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;            <span class="keyword">const</span> Point&amp; p1 = p[i];</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;            <span class="keyword">const</span> Point&amp; p2 = p[i - 1];</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160; </div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;            <span class="keywordflow">if</span> ( edge.isInside( p1 ) )</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;            {</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;                <span class="keywordflow">if</span> ( !edge.isInside( p2 ) )</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;                    clippedPoints += edge.intersection( p1, p2 );</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160; </div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;                clippedPoints += p1;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;            }</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;            <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( edge.isInside( p2 ) )</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;            {</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;                clippedPoints += edge.intersection( p1, p2 );</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;            }</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;        }</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    }</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160; </div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    <span class="keyword">const</span> Rect m_clipRect;</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;};</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160; </div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;<span class="keyword">class </span>QwtCircleClipper</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;{</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    <span class="keyword">explicit</span> QwtCircleClipper( <span class="keyword">const</span> QRectF&amp; r );</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    <a class="code" href="class_q_vector.html">QVector&lt; QwtInterval &gt;</a> <a class="code" href="namespace_qwt_clipper.html#ab36605186b4a1c411fccb3b68cf1724a">clipCircle</a>( <span class="keyword">const</span> QPointF&amp;, <span class="keywordtype">double</span> radius ) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160; </div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;    <span class="keyword">enum</span> Edge</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;    {</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;        Left,</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;        Top,</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;        Right,</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;        Bottom,</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160; </div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;        NEdges</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;    };</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160; </div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;    <a class="code" href="class_q_vector.html">QVector&lt; QPointF &gt;</a> cuttingPoints(</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;        Edge, <span class="keyword">const</span> QPointF&amp; pos, <span class="keywordtype">double</span> radius ) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160; </div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;    <span class="keywordtype">double</span> toAngle( <span class="keyword">const</span> QPointF&amp;, <span class="keyword">const</span> QPointF&amp; ) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160; </div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;    <span class="keyword">const</span> QRectF m_rect;</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;};</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160; </div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160; </div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;QwtCircleClipper::QwtCircleClipper( <span class="keyword">const</span> QRectF&amp; r )</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;    : m_rect( r )</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;{</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;}</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160; </div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;<a class="code" href="class_q_vector.html">QVector&lt; QwtInterval &gt;</a> QwtCircleClipper::clipCircle(</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    <span class="keyword">const</span> QPointF&amp; pos, <span class="keywordtype">double</span> radius )<span class="keyword"> const</span></div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;    <span class="comment">// using QVarLengthArray TODO ...</span></div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160; </div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;    <a class="code" href="class_q_vector.html">QVector&lt; QPointF &gt;</a> points;</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> edge = 0; edge &lt; NEdges; edge++ )</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;        points += cuttingPoints( <span class="keyword">static_cast&lt;</span> Edge <span class="keyword">&gt;</span>( edge ), pos, radius );</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160; </div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <a class="code" href="class_q_vector.html">QVector&lt; QwtInterval &gt;</a> intv;</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;    <span class="keywordflow">if</span> ( points.size() &lt;= 0 )</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    {</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;        QRectF cRect( 0, 0, 2 * radius, 2 * radius );</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;        cRect.moveCenter( pos );</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;        <span class="keywordflow">if</span> ( m_rect.contains( cRect ) )</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;            intv += <a class="code" href="class_qwt_interval.html">QwtInterval</a>( 0.0, 2 * M_PI );</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;    }</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;    <span class="keywordflow">else</span></div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;    {</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;        <a class="code" href="class_q_vector.html">QVector&lt; double &gt;</a> angles;</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;        angles.reserve( points.size() );</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160; </div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;        <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i &lt; points.size(); i++ )</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;            angles += toAngle( pos, points[i] );</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160; </div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;        std::sort( angles.begin(), angles.end() );</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160; </div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">int</span> in = m_rect.contains( qwtPolar2Pos( pos, radius,</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;            angles[0] + ( angles[1] - angles[0] ) / 2 ) );</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160; </div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;        intv.reserve( angles.size() / 2 );</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;        <span class="keywordflow">if</span> ( in )</div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;        {</div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;            <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i &lt; angles.size() - 1; i += 2 )</div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;                intv += <a class="code" href="class_qwt_interval.html">QwtInterval</a>( angles[i], angles[i + 1] );</div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;        }</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;        {</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;            <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 1; i &lt; angles.size() - 1; i += 2 )</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;                intv += <a class="code" href="class_qwt_interval.html">QwtInterval</a>( angles[i], angles[i + 1] );</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160; </div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;            intv += <a class="code" href="class_qwt_interval.html">QwtInterval</a>( angles.last(), angles.first() );</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;        }</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;    }</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160; </div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;    <span class="keywordflow">return</span> intv;</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;}</div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160; </div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;<span class="keywordtype">double</span> QwtCircleClipper::toAngle(</div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;    <span class="keyword">const</span> QPointF&amp; from, <span class="keyword">const</span> QPointF&amp; to )<span class="keyword"> const</span></div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;    <span class="keywordflow">if</span> ( from.x() == to.x() )</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;        <span class="keywordflow">return</span> from.y() &lt;= to.y() ? M_PI / 2.0 : 3 * M_PI / 2.0;</div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160; </div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">double</span> m = qAbs( ( to.y() - from.y() ) / ( to.x() - from.x() ) );</div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160; </div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;    <span class="keywordtype">double</span> angle = std::atan( m );</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;    <span class="keywordflow">if</span> ( to.x() &gt; from.x() )</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;    {</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;        <span class="keywordflow">if</span> ( to.y() &gt; from.y() )</div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;            angle = 2 * M_PI - angle;</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;    }</div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;    <span class="keywordflow">else</span></div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;    {</div>
<div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;        <span class="keywordflow">if</span> ( to.y() &gt; from.y() )</div>
<div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;            angle = M_PI + angle;</div>
<div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;            angle = M_PI - angle;</div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;    }</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160; </div>
<div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;    <span class="keywordflow">return</span> angle;</div>
<div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;}</div>
<div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160; </div>
<div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;<a class="code" href="class_q_vector.html">QVector&lt; QPointF &gt;</a> QwtCircleClipper::cuttingPoints(</div>
<div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;    Edge edge, <span class="keyword">const</span> QPointF&amp; pos, <span class="keywordtype">double</span> radius )<span class="keyword"> const</span></div>
<div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;    <a class="code" href="class_q_vector.html">QVector&lt; QPointF &gt;</a> points;</div>
<div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160; </div>
<div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;    <span class="keywordflow">if</span> ( edge == Left || edge == Right )</div>
<div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;    {</div>
<div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">double</span> x = ( edge == Left ) ? m_rect.left() : m_rect.right();</div>
<div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;        <span class="keywordflow">if</span> ( qAbs( pos.x() - x ) &lt; radius )</div>
<div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;        {</div>
<div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> off = std::sqrt( qwtSqr( radius ) - qwtSqr( pos.x() - x ) );</div>
<div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> m_y1 = pos.y() + off;</div>
<div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;            <span class="keywordflow">if</span> ( m_y1 &gt;= m_rect.top() &amp;&amp; m_y1 &lt;= m_rect.bottom() )</div>
<div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;                points += QPointF( x, m_y1 );</div>
<div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160; </div>
<div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> m_y2 = pos.y() - off;</div>
<div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;            <span class="keywordflow">if</span> ( m_y2 &gt;= m_rect.top() &amp;&amp; m_y2 &lt;= m_rect.bottom() )</div>
<div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;                points += QPointF( x, m_y2 );</div>
<div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;        }</div>
<div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;    }</div>
<div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;    <span class="keywordflow">else</span></div>
<div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;    {</div>
<div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">double</span> y = ( edge == Top ) ? m_rect.top() : m_rect.bottom();</div>
<div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;        <span class="keywordflow">if</span> ( qAbs( pos.y() - y ) &lt; radius )</div>
<div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;        {</div>
<div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> off = std::sqrt( qwtSqr( radius ) - qwtSqr( pos.y() - y ) );</div>
<div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> x1 = pos.x() + off;</div>
<div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;            <span class="keywordflow">if</span> ( x1 &gt;= m_rect.left() &amp;&amp; x1 &lt;= m_rect.right() )</div>
<div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;                points += QPointF( x1, y );</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160; </div>
<div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">double</span> m_x2 = pos.x() - off;</div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;            <span class="keywordflow">if</span> ( m_x2 &gt;= m_rect.left() &amp;&amp; m_x2 &lt;= m_rect.right() )</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;                points += QPointF( m_x2, y );</div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;        }</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;    }</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;    <span class="keywordflow">return</span> points;</div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;}</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160; </div>
<div class="line"><a name="l00369"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#a98a7c4009d2f8ac325b35255c85b0b34">  369</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">QwtClipper::clipPolygon</a>(</div>
<div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;    <span class="keyword">const</span> QRectF&amp; clipRect, QPolygon&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;{</div>
<div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> minX = qCeil( clipRect.left() );</div>
<div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> maxX = qFloor( clipRect.right() );</div>
<div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> minY = qCeil( clipRect.top() );</div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> maxY = qFloor( clipRect.bottom() );</div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160; </div>
<div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;    <span class="keyword">const</span> QRect r( minX, minY, maxX - minX, maxY - minY );</div>
<div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160; </div>
<div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;    QwtPolygonClipper&lt; QPolygon, QRect, int &gt; clipper( r );</div>
<div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;    clipper.clipPolygon( polygon, closePolygon );</div>
<div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;}</div>
<div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160; </div>
<div class="line"><a name="l00390"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">  390</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">QwtClipper::clipPolygon</a>(</div>
<div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;    <span class="keyword">const</span> QRect&amp; clipRect, QPolygon&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;{</div>
<div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;    QwtPolygonClipper&lt; QPolygon, QRect, int &gt; clipper( clipRect );</div>
<div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;    clipper.clipPolygon( polygon, closePolygon );</div>
<div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;}</div>
<div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160; </div>
<div class="line"><a name="l00404"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#aa5305d415fd97b332825e68b6cb25715">  404</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="namespace_qwt_clipper.html#aa5305d415fd97b332825e68b6cb25715">QwtClipper::clipPolygonF</a>(</div>
<div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;    <span class="keyword">const</span> QRectF&amp; clipRect, QPolygonF&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;{</div>
<div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;    QwtPolygonClipper&lt; QPolygonF, QRectF, double &gt; clipper( clipRect );</div>
<div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;    clipper.clipPolygon( polygon, closePolygon );</div>
<div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;}</div>
<div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160; </div>
<div class="line"><a name="l00420"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#a2891a88d006edea48ac0275da4d6de33">  420</a></span>&#160;QPolygon <a class="code" href="namespace_qwt_clipper.html#abf6fbe8c4d00b9608ac08278c4891cb8">QwtClipper::clippedPolygon</a>(</div>
<div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;    <span class="keyword">const</span> QRectF&amp; clipRect, <span class="keyword">const</span> QPolygon&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;{</div>
<div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;    QPolygon points( polygon );</div>
<div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;    <a class="code" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">clipPolygon</a>( clipRect, points, closePolygon );</div>
<div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160; </div>
<div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;    <span class="keywordflow">return</span> points;</div>
<div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;}</div>
<div class="line"><a name="l00437"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#abf6fbe8c4d00b9608ac08278c4891cb8">  437</a></span>&#160;QPolygon <a class="code" href="namespace_qwt_clipper.html#abf6fbe8c4d00b9608ac08278c4891cb8">QwtClipper::clippedPolygon</a>(</div>
<div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;    <span class="keyword">const</span> QRect&amp; clipRect, <span class="keyword">const</span> QPolygon&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;{</div>
<div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;    QPolygon points( polygon );</div>
<div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;    <a class="code" href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">clipPolygon</a>( clipRect, points, closePolygon );</div>
<div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160; </div>
<div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;    <span class="keywordflow">return</span> points;</div>
<div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;}</div>
<div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160; </div>
<div class="line"><a name="l00455"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#a7c876c77f33931add58f80a98885af07">  455</a></span>&#160;QPolygonF <a class="code" href="namespace_qwt_clipper.html#a7c876c77f33931add58f80a98885af07">QwtClipper::clippedPolygonF</a>(</div>
<div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;    <span class="keyword">const</span> QRectF&amp; clipRect, <span class="keyword">const</span> QPolygonF&amp; polygon, <span class="keywordtype">bool</span> closePolygon )</div>
<div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;{</div>
<div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;    QPolygonF points( polygon );</div>
<div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;    <a class="code" href="namespace_qwt_clipper.html#aa5305d415fd97b332825e68b6cb25715">clipPolygonF</a>( clipRect, points, closePolygon );</div>
<div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160; </div>
<div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;    <span class="keywordflow">return</span> points;</div>
<div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;}</div>
<div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160; </div>
<div class="line"><a name="l00477"></a><span class="lineno"><a class="line" href="namespace_qwt_clipper.html#ab36605186b4a1c411fccb3b68cf1724a">  477</a></span>&#160;<a class="code" href="class_q_vector.html">QVector&lt; QwtInterval &gt;</a> <a class="code" href="namespace_qwt_clipper.html#ab36605186b4a1c411fccb3b68cf1724a">QwtClipper::clipCircle</a>( <span class="keyword">const</span> QRectF&amp; clipRect,</div>
<div class="line"><a name="l00478"></a><span class="lineno">  478</span>&#160;    <span class="keyword">const</span> QPointF&amp; center, <span class="keywordtype">double</span> radius )</div>
<div class="line"><a name="l00479"></a><span class="lineno">  479</span>&#160;{</div>
<div class="line"><a name="l00480"></a><span class="lineno">  480</span>&#160;    QwtCircleClipper clipper( clipRect );</div>
<div class="line"><a name="l00481"></a><span class="lineno">  481</span>&#160;    <span class="keywordflow">return</span> clipper.clipCircle( center, radius );</div>
<div class="line"><a name="l00482"></a><span class="lineno">  482</span>&#160;}</div>
<div class="ttc" id="aclass_q_vector_html"><div class="ttname"><a href="class_q_vector.html">QVector</a></div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8h_source.html#l00023">qwt_clipper.h:23</a></div></div>
<div class="ttc" id="aclass_qwt_interval_html"><div class="ttname"><a href="class_qwt_interval.html">QwtInterval</a></div><div class="ttdoc">A class representing an interval.</div><div class="ttdef"><b>Definition:</b> <a href="qwt__interval_8h_source.html#l00022">qwt_interval.h:23</a></div></div>
<div class="ttc" id="anamespace_qwt_clipper_html_a4bbafdea07dca5589537e6db1c7c0b6e"><div class="ttname"><a href="namespace_qwt_clipper.html#a4bbafdea07dca5589537e6db1c7c0b6e">QwtClipper::clipPolygon</a></div><div class="ttdeci">QWT_EXPORT void clipPolygon(const QRect &amp;, QPolygon &amp;, bool closePolygon=false)</div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8cpp_source.html#l00390">qwt_clipper.cpp:390</a></div></div>
<div class="ttc" id="anamespace_qwt_clipper_html_a7c876c77f33931add58f80a98885af07"><div class="ttname"><a href="namespace_qwt_clipper.html#a7c876c77f33931add58f80a98885af07">QwtClipper::clippedPolygonF</a></div><div class="ttdeci">QWT_EXPORT QPolygonF clippedPolygonF(const QRectF &amp;, const QPolygonF &amp;, bool closePolygon=false)</div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8cpp_source.html#l00455">qwt_clipper.cpp:455</a></div></div>
<div class="ttc" id="anamespace_qwt_clipper_html_aa5305d415fd97b332825e68b6cb25715"><div class="ttname"><a href="namespace_qwt_clipper.html#aa5305d415fd97b332825e68b6cb25715">QwtClipper::clipPolygonF</a></div><div class="ttdeci">QWT_EXPORT void clipPolygonF(const QRectF &amp;, QPolygonF &amp;, bool closePolygon=false)</div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8cpp_source.html#l00404">qwt_clipper.cpp:404</a></div></div>
<div class="ttc" id="anamespace_qwt_clipper_html_ab36605186b4a1c411fccb3b68cf1724a"><div class="ttname"><a href="namespace_qwt_clipper.html#ab36605186b4a1c411fccb3b68cf1724a">QwtClipper::clipCircle</a></div><div class="ttdeci">QWT_EXPORT QVector&lt; QwtInterval &gt; clipCircle(const QRectF &amp;, const QPointF &amp;, double radius)</div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8cpp_source.html#l00477">qwt_clipper.cpp:477</a></div></div>
<div class="ttc" id="anamespace_qwt_clipper_html_abf6fbe8c4d00b9608ac08278c4891cb8"><div class="ttname"><a href="namespace_qwt_clipper.html#abf6fbe8c4d00b9608ac08278c4891cb8">QwtClipper::clippedPolygon</a></div><div class="ttdeci">QWT_EXPORT QPolygon clippedPolygon(const QRect &amp;, const QPolygon &amp;, bool closePolygon=false)</div><div class="ttdef"><b>Definition:</b> <a href="qwt__clipper_8cpp_source.html#l00437">qwt_clipper.cpp:437</a></div></div>
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